Question

Solve. X²-8x+1280 by formula method

Answer 1

By factorisation method,

${x}^{2} - 8x + 1280 \\ = {x}^{2} - 40x + 32x + 1280 \\ = x(x - 40) + 32(x - 40) \\ = (x + 32)(x - 40)$

So, x=-32 and 40

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